Is anyone know how to draw a simple cylinder shape pressure vessel? I read the book but still couldn't understand how to start the drawing.

hahahah can't do assignment ah? good luck bro, try this -

http://mae.uta.edu/~lawrence/ansys/thick_c...ck_cylinder.htm

Bro, thanks for your useful link. I have already draw the 3D shape but still have some parts no idea, eg hole at the center of pressure vessel and fillet between cylinder and sphere cap like in attached picture.. You have any idea? Here is attach picture... Need to do for fyp..... hehe






This post has been edited by Alvan86: Feb 23 2010, 07:03 PM

Bro, this pdf shows you the solution step by step

http://www.ndsu.edu/me/images/Kallmeyer/47...l%20Example.pdf

I thought you wanted to study fashion design? Your expertise in FEA needs to be drastically improved ...

Exact same assignment

Anyway since its just 2D the problem is quite straight forward. I think something like solidworks can easily be used to draw out the geometry.

A greater challenge would be creating and meshing similar geometry in 3D

I have already draw the pressure vessel. But, the problem is make openings on pressure vessel. Is there any way to remove the 2 blocks as in the attached pic? I have already tried using boolean substrate but still cn nt. That pdf only shows how to create and analyse section of pressure vessel. Between, how you know I wanted to study fashion design?

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Added on February 23, 2010, 7:12 pmIt is actually my fyp. I just search the web and found that pic. I only refer dimensions of the pressure vessel from that pic. Once draw out the 3D pressure vessel, need to put 2 openings on it and carry out structural analysis.

This post has been edited by Alvan86: Feb 23 2010, 07:12 PM

What program are you using to draw the geometry? Boolean subtract should do the job, unless theres some problem with the way your geometry links up. My FYP is in CFD. Did all my modeling and meshing using some pre-processor bundled with the CFD (FLUENT) software.

Btw...i believe map is a girl

yea joe is right, boolean subtract should easily solve your problem ...

well, try to take a look at these examples to give you a rough idea of how boolean subtract should work

http://courses.cit.cornell.edu/ansys/plate/step04.htm
http://me.lsu.edu/~mechar/tutor/ansy_ra2.PDF

btw joe, what CFD software did u use? share share

p/s - TS i know you wanted to study your fashion design because i'm a spy -,-

Basically its a thermal and depressurization analysis of a 16km natural pipe segment with 20+meter vent header for blowdown and flaring. Ive been using GAMBIT & FLUENT. Initially did all my drawing and meshing with GAMBIT before exporting to FLUENT. The geometry is simple enough, but meshing was quite a pain. Eventually managed to get it down to a 100000 cell mesh that still takes 2 days on my quaddie to run full depressurization. Right now migrating to ANSYS 12 based FLUENT as the GUI is better

I have no experience at all in FEA though, thats still unexplored territory for me. Haven't even ventured into using CFX yet

I use Ansys to draw the geometry. It is difficult to put opening on pressure vessel due to its cylindrical surface. I have had tried several ways to do it but still unsuccessful. For eg, I draw a block on the surface and subtract, at the end, it still same. I did try to use key point function to draw, but it is hard to locate key point on spherical surface. No idea currently....

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Added on March 1, 2010, 10:28 pmAlready go thru your site. But, the problem still haven't resolve. Do we know each other?

This post has been edited by Alvan86: Mar 1 2010, 10:28 PM

Have you tried creating a block seperately, moving it so that it intersects the sections you want to remove, and then subtracting?

EDIT: I had NBTD (actually must study for exam ) so i tried creating your geometry using GAMBIT. Heres my result



I used the basic technique i outlined above. Create a brick, move it to required location, n then subtract it from the main vessel volume. I didnt have any issues doing this with GAMBIT. Same approach can be used for the fillets too. Meshing this though will be another story

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Added on March 4, 2010, 6:19 am@TS
Any updates? Lets start an FEA/CFD discussion here lah. Seems fitting for the PhD section .

This post has been edited by joe_star: Mar 4 2010, 06:19 AM

Bro, you done good job. You model is exactly same with me. Between, do you have idea on how to create obround shape hole? and obround shape plate cover on top of hole? Still figuring way to do....

which part is that? i'm not really sure what you mean? perhaps an isometric of the geometry you need would help

Something like this obround shape hole on cylindrical wall. Already create block penetrate inside but don't know how to substrate obround hole (Rectangular width 2.5 in X height 1in with 2 half-circle of radius 0.5 inch join each end of rectangular). Once done, need to create obround shape plate with specific thickness cover the hole.